/**
  *@File文件:VerifyCodeUtils.java
  *@Date日期:2017年7月20日 上午10:46:02
  *@Copyright版权:Corporation 2017
  */
package com.qiaomengapp.util;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Arrays;
import java.util.Random;

import javax.imageio.ImageIO;

/**
 *@Description描述:
 *@Author作者 jinxin
 *@Date日期:2017年7月20日
 */
public class VerifyCodeUtils {	     
	    //使用到Algerian字体，系统里没有的话需要安装字体，字体只显示大写，去掉了1,0,i,o几个容易混淆的字符
	    public static final String VERIFY_CODES = "23456789ABCDEFGHJKLMNPQRSTUVWXYZ";
	    private static Random random = new Random();
	 
	 
	    /**
	     * 使用系统默认字符源生成验证码
	     * @param verifySize    验证码长度
	     * @return
	     */
	    public static String generateVerifyCode(int verifySize){
	        return generateVerifyCode(verifySize, VERIFY_CODES);
	    }
	    /**
	     * 使用指定源生成验证码
	     * @param verifySize    验证码长度
	     * @param sources   验证码字符源
	     * @return
	     */
	    public static String generateVerifyCode(int verifySize, String sources){
	        if(sources == null || sources.length() == 0){
	            sources = VERIFY_CODES;
	        }
	        int codesLen = sources.length();
	        Random rand = new Random(System.currentTimeMillis());
	        StringBuilder verifyCode = new StringBuilder(verifySize);
	        for(int i = 0; i < verifySize; i++){
	            verifyCode.append(sources.charAt(rand.nextInt(codesLen-1)));
	        }
	        return verifyCode.toString();
	    }
	     
	    /**
	     * 生成随机验证码文件,并返回验证码值
	     * @param w
	     * @param h
	     * @param outputFile
	     * @param verifySize
	     * @return
	     * @throws IOException
	     */
	    public static String outputVerifyImage(int w, int h, File outputFile, int verifySize) throws IOException{
	        String verifyCode = generateVerifyCode(verifySize);
	        outputImage(w, h, outputFile, verifyCode);
	        return verifyCode;
	    }
	     
	    /**
	     * 输出随机验证码图片流,并返回验证码值
	     * @param w
	     * @param h
	     * @param os
	     * @param verifySize
	     * @return
	     * @throws IOException
	     */
	    public static String outputVerifyImage(int w, int h, OutputStream os, int verifySize) throws IOException{
	        String verifyCode = generateVerifyCode(verifySize);
	        outputImage(w, h, os, verifyCode);
	        return verifyCode;
	    }
	     
	    /**
	     * 生成指定验证码图像文件
	     * @param w
	     * @param h
	     * @param outputFile
	     * @param code
	     * @throws IOException
	     */
	    public static void outputImage(int w, int h, File outputFile, String code) throws IOException{
	        if(outputFile == null){
	            return;
	        }
	        File dir = outputFile.getParentFile();
	        if(!dir.exists()){
	            dir.mkdirs();
	        }
	        try{
	            outputFile.createNewFile();
	            FileOutputStream fos = new FileOutputStream(outputFile);
	            outputImage(w, h, fos, code);
	            fos.close();
	        } catch(IOException e){
	            throw e;
	        }
	    }
	     
	    /**
	     * 输出指定验证码图片流
	     * @param w
	     * @param h
	     * @param os
	     * @param code
	     * @throws IOException
	     */
	    public static void outputImage(int w, int h, OutputStream os, String code) throws IOException{
	        int verifySize = code.length();
	        BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
	        Random rand = new Random();
	        Graphics2D g2 = image.createGraphics();
	        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);
	        Color[] colors = new Color[5];
	        Color[] colorSpaces = new Color[] { Color.WHITE, Color.CYAN,
	                Color.GRAY, Color.LIGHT_GRAY, Color.MAGENTA, Color.ORANGE,
	                Color.PINK, Color.YELLOW };
	        float[] fractions = new float[colors.length];
	        for(int i = 0; i < colors.length; i++){
	            colors[i] = colorSpaces[rand.nextInt(colorSpaces.length)];
	            fractions[i] = rand.nextFloat();
	        }
	        Arrays.sort(fractions);
	         
	        g2.setColor(Color.GRAY);// 设置边框色
	        g2.fillRect(0, 0, w, h);
	         
	        Color c = getRandColor(200, 250);
	        g2.setColor(c);// 设置背景色
	        g2.fillRect(0, 2, w, h-4);
	         
	        //绘制干扰线
	        Random random = new Random();
	        g2.setColor(getRandColor(160, 200));// 设置线条的颜色
	        for (int i = 0; i < 20; i++) {
	            int x = random.nextInt(w - 1);
	            int y = random.nextInt(h - 1);
	            int xl = random.nextInt(6) + 1;
	            int yl = random.nextInt(12) + 1;
	            g2.drawLine(x, y, x + xl + 40, y + yl + 20);
	        }
	         
	        // 添加噪点
	        float yawpRate = 0.05f;// 噪声率
	        int area = (int) (yawpRate * w * h);
	        for (int i = 0; i < area; i++) {
	            int x = random.nextInt(w);
	            int y = random.nextInt(h);
	            int rgb = getRandomIntColor();
	            image.setRGB(x, y, rgb);
	        }
	         
	        shear(g2, w, h, c);// 使图片扭曲
	 
	        g2.setColor(getRandColor(100, 160));
	        int fontSize = h-4;
	        Font font = new Font("Algerian", Font.ITALIC, fontSize);
	        g2.setFont(font);
	        char[] chars = code.toCharArray();
	        for(int i = 0; i < verifySize; i++){
	            AffineTransform affine = new AffineTransform();
	            affine.setToRotation(Math.PI / 4 * rand.nextDouble() * (rand.nextBoolean() ? 1 : -1), (w / verifySize) * i + fontSize/2, h/2);
	            g2.setTransform(affine);
	            g2.drawChars(chars, i, 1, ((w-10) / verifySize) * i + 5, h/2 + fontSize/2 - 10);
	        }
	         
	        g2.dispose();
	        ImageIO.write(image, "jpg", os);
	    }
	     
	    private static Color getRandColor(int fc, int bc) {
	        if (fc > 255)
	            fc = 255;
	        if (bc > 255)
	            bc = 255;
	        int r = fc + random.nextInt(bc - fc);
	        int g = fc + random.nextInt(bc - fc);
	        int b = fc + random.nextInt(bc - fc);
	        return new Color(r, g, b);
	    }
	     
	    private static int getRandomIntColor() {
	        int[] rgb = getRandomRgb();
	        int color = 0;
	        for (int c : rgb) {
	            color = color << 8;
	            color = color | c;
	        }
	        return color;
	    }
	     
	    private static int[] getRandomRgb() {
	        int[] rgb = new int[3];
	        for (int i = 0; i < 3; i++) {
	            rgb[i] = random.nextInt(255);
	        }
	        return rgb;
	    }
	 
	    private static void shear(Graphics g, int w1, int h1, Color color) {
	        shearX(g, w1, h1, color);
	        shearY(g, w1, h1, color);
	    }
	     
	    private static void shearX(Graphics g, int w1, int h1, Color color) {
	 
	        int period = random.nextInt(2);
	 
	        boolean borderGap = true;
	        int frames = 1;
	        int phase = random.nextInt(2);
	 
	        for (int i = 0; i < h1; i++) {
	            double d = (double) (period >> 1)
	                    * Math.sin((double) i / (double) period
	                            + (6.2831853071795862D * (double) phase)
	                            / (double) frames);
	            g.copyArea(0, i, w1, 1, (int) d, 0);
	            if (borderGap) {
	                g.setColor(color);
	                g.drawLine((int) d, i, 0, i);
	                g.drawLine((int) d + w1, i, w1, i);
	            }
	        }
	 
	    }
	 
	    private static void shearY(Graphics g, int w1, int h1, Color color) {
	 
	        int period = random.nextInt(40) + 10; // 50;
	 
	        boolean borderGap = true;
	        int frames = 20;
	        int phase = 7;
	        for (int i = 0; i < w1; i++) {
	            double d = (double) (period >> 1)
	                    * Math.sin((double) i / (double) period
	                            + (6.2831853071795862D * (double) phase)
	                            / (double) frames);
	            g.copyArea(i, 0, 1, h1, 0, (int) d);
	            if (borderGap) {
	                g.setColor(color);
	                g.drawLine(i, (int) d, i, 0);
	                g.drawLine(i, (int) d + h1, i, h1);
	            }
	 
	        }
	 
	    }
	    public static void main(String[] args) throws IOException{
	        File dir = new File("F:/verifies");
	        int w = 200, h = 80;
	        for(int i = 0; i < 50; i++){
	            String verifyCode = generateVerifyCode(4);
	            File file = new File(dir, verifyCode + ".jpg");
	            outputImage(w, h, file, verifyCode);
	        }
	    }
	
}
